/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.streamline.services;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ScheduledThreadPoolExecutor;

/**
 * Service class to handle Thread-based operations
 */
public class ThreadServices {

    public static final int                     DEFAULT_THREAD_POOL_SIZE = 1000;

    private static ScheduledThreadPoolExecutor  stpe;

    private static Timer                        timer;

    /**
     * Init method for Thread services of streamline invoked by the ApplicationServices
     * @param corePoolSize size of the threadpool
     */
    public static void init( int corePoolSize ){  
        stpe = new ScheduledThreadPoolExecutor( corePoolSize );
        timer = new Timer();
    }

    /**
     * Finalize method for Thread services of streamline invoked by the termination of the application server
     */
    public static void stop( ){
        try{
            timer.cancel();
        }catch(Exception e){}
        stpe.shutdownNow();
    }

    /**
     * Getter method for the ScheduledThreadPoolExecutor instance used by streamline
     */
    public static ScheduledThreadPoolExecutor getStpe() {
        if( stpe == null )
            init( DEFAULT_THREAD_POOL_SIZE );

        return stpe;
    }

    /**
     * Schedules a task with the given date
     */
    public static void scheduleSingleTask(TimerTask task, Date time){
        timer.schedule( task, time );
    }

    /**
     * Schedules a task with the given delay
     */
    public static void scheduleSingleTask(TimerTask task, long delay){
        timer.schedule( task, delay );
    }
    
}
